Development of CdTe quantum dot supported ZnIn2S4 hierarchical microflowers for improved photocatalytic activity

R. Janani; S. Sumathi; Bhavana Gupta; A. R.Mahammed Shaheer; Sasikala Ganapathy; Bernaurdshaw Neppolian; Somnath C. Roy; Rashmi Channakrishnappa; Bishwajit Paul; Shubra Singh

doi:10.1016/j.jece.2021.107030

Development of CdTe quantum dot supported ZnIn₂S₄ hierarchical microflowers for improved photocatalytic activity

R. Janani, S. Sumathi, Bhavana Gupta, A. R.Mahammed Shaheer, Sasikala Ganapathy, Bernaurdshaw Neppolian, Somnath C. Roy, Rashmi Channakrishnappa, Bishwajit Paul, Shubra Singh

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

Solar hydrogen production has been successfully demonstrated with CdTe quantum dot (QD) supported porous hierarchical ZnIn₂S₄. A reduction in effective bandgap from 2.7 eV (for ZnIn₂S₄) to 2.56 eV (for ZnIn₂S₄/CdTe QD composite) was observed. An efficient charge transfer between ZnIn₂S₄ and CdTe in the ZnIn₂S₄/CdTe QD composite is confirmed from Photoluminescence (PL) studies. Effective reduction in bandgap of composite heterostructure enhances the absorption in visible spectrum and generates more charge carriers, as corroborated from PEC measurements (~ 5.7 μA/cm²). In the present work 3% CdTe QDs decorated with ZnIn₂S₄ (ZCd3) exhibits higher photocatalytic activity during degradation of Rhodamine B (RhB) dye by 94% in 35 min. An excellent photocatalytic performance of ZCd3 sample was also noted during H₂ production yielding a production rate of 1070 μmol g⁻¹ in 3 h. It is believed that the integration of CdTe quantum dot with ZnIn₂S₄ enhances the photocatalytic efficiency of ZnIn₂S₄ by improving charge carrier separation and transfer.

Original language	English
Article number	107030
Journal	Journal of Environmental Chemical Engineering
Volume	10
Issue number	1
DOIs	https://doi.org/10.1016/j.jece.2021.107030
State	Published - 1 Feb 2022
Externally published	Yes

Keywords

Hydrogen production
Microflowers
Organic dye removal
Photocatalytic activity
Quantum dots

ASJC Scopus subject areas

Chemical Engineering (miscellaneous)
Waste Management and Disposal
Pollution
Process Chemistry and Technology

Access to Document

10.1016/j.jece.2021.107030

Cite this

Janani, R., Sumathi, S., Gupta, B., Shaheer, A. R. M., Ganapathy, S., Neppolian, B., Roy, S. C., Channakrishnappa, R., Paul, B., & Singh, S. (2022). Development of CdTe quantum dot supported ZnIn₂S₄ hierarchical microflowers for improved photocatalytic activity. Journal of Environmental Chemical Engineering, 10(1), Article 107030. https://doi.org/10.1016/j.jece.2021.107030

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abstract = "Solar hydrogen production has been successfully demonstrated with CdTe quantum dot (QD) supported porous hierarchical ZnIn2S4. A reduction in effective bandgap from 2.7 eV (for ZnIn2S4) to 2.56 eV (for ZnIn2S4/CdTe QD composite) was observed. An efficient charge transfer between ZnIn2S4 and CdTe in the ZnIn2S4/CdTe QD composite is confirmed from Photoluminescence (PL) studies. Effective reduction in bandgap of composite heterostructure enhances the absorption in visible spectrum and generates more charge carriers, as corroborated from PEC measurements (~ 5.7 μA/cm2). In the present work 3% CdTe QDs decorated with ZnIn2S4 (ZCd3) exhibits higher photocatalytic activity during degradation of Rhodamine B (RhB) dye by 94% in 35 min. An excellent photocatalytic performance of ZCd3 sample was also noted during H2 production yielding a production rate of 1070 μmol g−1 in 3 h. It is believed that the integration of CdTe quantum dot with ZnIn2S4 enhances the photocatalytic efficiency of ZnIn2S4 by improving charge carrier separation and transfer.",

keywords = "Hydrogen production, Microflowers, Organic dye removal, Photocatalytic activity, Quantum dots",

author = "R. Janani and S. Sumathi and Bhavana Gupta and Shaheer, {A. R.Mahammed} and Sasikala Ganapathy and Bernaurdshaw Neppolian and Roy, {Somnath C.} and Rashmi Channakrishnappa and Bishwajit Paul and Shubra Singh",

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AU - Ganapathy, Sasikala

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AB - Solar hydrogen production has been successfully demonstrated with CdTe quantum dot (QD) supported porous hierarchical ZnIn2S4. A reduction in effective bandgap from 2.7 eV (for ZnIn2S4) to 2.56 eV (for ZnIn2S4/CdTe QD composite) was observed. An efficient charge transfer between ZnIn2S4 and CdTe in the ZnIn2S4/CdTe QD composite is confirmed from Photoluminescence (PL) studies. Effective reduction in bandgap of composite heterostructure enhances the absorption in visible spectrum and generates more charge carriers, as corroborated from PEC measurements (~ 5.7 μA/cm2). In the present work 3% CdTe QDs decorated with ZnIn2S4 (ZCd3) exhibits higher photocatalytic activity during degradation of Rhodamine B (RhB) dye by 94% in 35 min. An excellent photocatalytic performance of ZCd3 sample was also noted during H2 production yielding a production rate of 1070 μmol g−1 in 3 h. It is believed that the integration of CdTe quantum dot with ZnIn2S4 enhances the photocatalytic efficiency of ZnIn2S4 by improving charge carrier separation and transfer.

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